Mercurial > hg > octave-kai > gnulib-hg
annotate lib/malloca.h @ 10256:af15fcca9925
getdate.y: do not ignore TZ with relative day, month or year offset
* lib/getdate.y (get_date): Move the tz-handling block to follow the
relative-date-handling, since otherwise, the latter would clobber the
sole output (an updated Start value) of the tz-handling block.
* tests/test-getdate.c: Tests for the fix
| author | Ondřej Vašík <ovasik@redhat.com> |
|---|---|
| date | Thu, 03 Jul 2008 12:17:11 +0200 |
| parents | c487592d112a |
| children | 2d40c73ca3d5 |
| rev | line source |
|---|---|
| 8930 | 1 /* Safe automatic memory allocation. |
| 2 Copyright (C) 2003-2007 Free Software Foundation, Inc. | |
| 3 Written by Bruno Haible <bruno@clisp.org>, 2003. | |
| 4 | |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2, or (at your option) | |
| 8 any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software Foundation, | |
| 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 18 | |
| 19 #ifndef _MALLOCA_H | |
| 20 #define _MALLOCA_H | |
| 21 | |
| 22 #include <alloca.h> | |
| 23 #include <stddef.h> | |
| 24 #include <stdlib.h> | |
| 25 | |
| 26 | |
| 27 #ifdef __cplusplus | |
| 28 extern "C" { | |
| 29 #endif | |
| 30 | |
| 31 | |
| 32 /* safe_alloca(N) is equivalent to alloca(N) when it is safe to call | |
| 33 alloca(N); otherwise it returns NULL. It either returns N bytes of | |
| 34 memory allocated on the stack, that lasts until the function returns, | |
| 35 or NULL. | |
| 36 Use of safe_alloca should be avoided: | |
| 37 - inside arguments of function calls - undefined behaviour, | |
| 38 - in inline functions - the allocation may actually last until the | |
| 39 calling function returns. | |
| 40 */ | |
| 41 #if HAVE_ALLOCA | |
| 42 /* The OS usually guarantees only one guard page at the bottom of the stack, | |
| 43 and a page size can be as small as 4096 bytes. So we cannot safely | |
| 44 allocate anything larger than 4096 bytes. Also care for the possibility | |
| 45 of a few compiler-allocated temporary stack slots. | |
| 46 This must be a macro, not an inline function. */ | |
| 47 # define safe_alloca(N) ((N) < 4032 ? alloca (N) : NULL) | |
| 48 #else | |
| 49 # define safe_alloca(N) ((void) (N), NULL) | |
| 50 #endif | |
| 51 | |
| 52 /* malloca(N) is a safe variant of alloca(N). It allocates N bytes of | |
| 53 memory allocated on the stack, that must be freed using freea() before | |
| 54 the function returns. Upon failure, it returns NULL. */ | |
| 55 #if HAVE_ALLOCA | |
| 56 # define malloca(N) \ | |
| 57 ((N) < 4032 - sa_increment \ | |
| 58 ? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \ | |
| 59 : mmalloca (N)) | |
| 60 #else | |
| 61 # define malloca(N) \ | |
| 62 mmalloca (N) | |
| 63 #endif | |
| 64 extern void * mmalloca (size_t n); | |
| 65 | |
| 66 /* Free a block of memory allocated through malloca(). */ | |
| 67 #if HAVE_ALLOCA | |
| 68 extern void freea (void *p); | |
| 69 #else | |
| 70 # define freea free | |
| 71 #endif | |
| 72 | |
|
9558
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
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73 /* nmalloca(N,S) is an overflow-safe variant of malloca (N * S). |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
74 It allocates an array of N objects, each with S bytes of memory, |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
75 on the stack. S must be positive and N must be nonnegative. |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
76 The array must be freed using freea() before the function returns. */ |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
77 #if 1 |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
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78 /* Cf. the definition of xalloc_oversized. */ |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
79 # define nmalloca(n, s) \ |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
80 ((n) > (size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) \ |
|
c487592d112a
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Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
81 ? NULL \ |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
82 : malloca ((n) * (s))) |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
83 #else |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
84 extern void * nmalloca (size_t n, size_t s); |
|
c487592d112a
Protect against integer overflow in malloca() calls.
Bruno Haible <bruno@clisp.org>
parents:
8930
diff
changeset
|
85 #endif |
| 8930 | 86 |
| 87 | |
| 88 #ifdef __cplusplus | |
| 89 } | |
| 90 #endif | |
| 91 | |
| 92 | |
| 93 /* ------------------- Auxiliary, non-public definitions ------------------- */ | |
| 94 | |
| 95 /* Determine the alignment of a type at compile time. */ | |
| 96 #if defined __GNUC__ | |
| 97 # define sa_alignof __alignof__ | |
| 98 #elif defined __cplusplus | |
| 99 template <class type> struct sa_alignof_helper { char __slot1; type __slot2; }; | |
| 100 # define sa_alignof(type) offsetof (sa_alignof_helper<type>, __slot2) | |
| 101 #elif defined __hpux | |
| 102 /* Work around a HP-UX 10.20 cc bug with enums constants defined as offsetof | |
| 103 values. */ | |
| 104 # define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8) | |
| 105 #elif defined _AIX | |
| 106 /* Work around an AIX 3.2.5 xlc bug with enums constants defined as offsetof | |
| 107 values. */ | |
| 108 # define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8) | |
| 109 #else | |
| 110 # define sa_alignof(type) offsetof (struct { char __slot1; type __slot2; }, __slot2) | |
| 111 #endif | |
| 112 | |
| 113 enum | |
| 114 { | |
| 115 /* The desired alignment of memory allocations is the maximum alignment | |
| 116 among all elementary types. */ | |
| 117 sa_alignment_long = sa_alignof (long), | |
| 118 sa_alignment_double = sa_alignof (double), | |
| 119 #if HAVE_LONG_LONG_INT | |
| 120 sa_alignment_longlong = sa_alignof (long long), | |
| 121 #endif | |
| 122 sa_alignment_longdouble = sa_alignof (long double), | |
| 123 sa_alignment_max = ((sa_alignment_long - 1) | (sa_alignment_double - 1) | |
| 124 #if HAVE_LONG_LONG_INT | |
| 125 | (sa_alignment_longlong - 1) | |
| 126 #endif | |
| 127 | (sa_alignment_longdouble - 1) | |
| 128 ) + 1, | |
| 129 /* The increment that guarantees room for a magic word must be >= sizeof (int) | |
| 130 and a multiple of sa_alignment_max. */ | |
| 131 sa_increment = ((sizeof (int) + sa_alignment_max - 1) / sa_alignment_max) * sa_alignment_max | |
| 132 }; | |
| 133 | |
| 134 #endif /* _MALLOCA_H */ |